Its focus is on the conversion of units of area, requiring students to possess prior understanding of converting lengths and familiarity with the concept of square numbers. It is designed for students in Year 7 or Year 8, specifically targeting Key Stage 3. The captivating activity involved in this lesson revolves around solving a murder mystery. The lesson begins with a stimulating starter activity, which encourages students to awaken their minds by actively searching for pairs of matching cards. This activity serves as an engaging warm-up exercise. For the reference of teachers, I have also included the flow of the lesson.